Pulp-screen.



A. J. HAUG.

PULP SCREEN. `APPLICATHQN'FILED JUNE 2| 1914.

Patented 132.1151916.

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ANTON 5'. HAUG, OF NASHUA, NEW HAMPSHIRE, ASSIGNOR TO II'LPBUOVED PAPER MACHINERY COMPANY, OF NASHUA, NEW HAMPSHIRE, A CORPORATION OF MAINE.

PULP-SCREEN.

Application inea Jane 2, 1914.

To all whom t may concern.'

Be it known that I, ANTON J. HAUG, a subject of the Emperor of Germany, and a resident of Nashua, county of Hillsboro, State of New Hampshire, whose post-oiiice address is care of Improved Paper Machinery Company, Nashua, New Hampshire, have invented an Improvement in Pulp- Screens, of `which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to pulp screens and more particularly, though not exclusively, to machines of the type wherein the stock is delivered tothe interior of the screen and forced against the same by means of an impeller, the tine bers being forced through the screen and the coarser particles being discharged from the end thereof.

This invention relates more particularly, though not exclusively, to improvements in the screen and the mounting thereof and in the means for discharging the stock into the interior of the screen.

The invention will be best understood by reference to the following description when taken in connection with the accompanying illustration of `one specific embodiment thereof, while its scope will be more particularly pointed out in the appended claims.

1n the drawings: Figure 1 is acentral, longitudinal section in elevation showing a plup screen embodying one form of the invention; Fig. 2 is a section in plan of the screen shown in Fig. 1; and Fig. 3 is a detail view of the impeller blades.

Referring to the illustrative embodiment of t-he invention and more particularly to Fig. 1,ithe machine there shown is provided with end castings 1 and 2 resting upon the feet 3 and i and providing bearings 5 and G for an impeller shaft 7.' The latter is driven by any suitable means, as for eX- ample, by the belt driven pulley 8 shown at the righ-t in Fig. 1. The end castings hold fixedly supported between them a substantially cylindrical casing 9 within which there isprovided a cylindrical screen 10 of smaller diameter than the casing so that there is provided outside of the screen and within the casing an annular screened-pulpreceiving chamber 11, the bottom of which is Specification of Letters Patent.

tion of rest.

Patent-.ea ret. is, raie.

Serial No. 842,524.

provided with a discharge s pout 12 from which the screened pulp discharged to any suitable receptacle. The opposite ends of the f annular screened-Imlp-receiving chamber are closed by annular end plates 13 and 1dr-, respectively, through which are discharged from within the screen the coarser particles which cannot pass through the screen. The end plates 13 and 1e are provided with inwardly turned flanges 15 and 16, respectively, which serve as bearing supports for the screen 10 when, as in the case of the illustrated embodiment of the invention, the screen is made rotatable. The screen is secured at opposite ends directly to the annular supporting members 17 and 18, the latter in turn being ,ured to the bearing rings 19 and 20, respectively, whereby the screen has journaled supperu upon the flanges 15 and 16 of the end plates.

To turn the screen each ring 19 and 20 is provided with gear teeth which mesh with pinions 21 (shown in dotted lines in Fig. 1) mounted upon the shaft 22, the latter connected to be turned by any suitable driving mechanism. Herein the shaft Q2 is adapted to be clutched to or unclutched from a driving sleeve 23 by an intermediate clutch device Q4, the latter being adapted to be slid lengthwise the shaft 22 by any suitable clutch operating lever (not shown). The driving sleeve 23 is driven by the. gear 25 meshing with the pinion 2G on the countershaft 27, the latter turned by the driving gear 28. The gear 28 may be turned from a driving pinion on the impeller shaft 7 (not herein shown). TNhen the clutch sleeve 24; is thrown to its opposite position it engages the stop 29 and brings the screen to a pos1- The hand wheel 30 may be employed to turn the pinion Q1 and rotate t ie screen as may be required from time to To force the stock` against the interior of the screen the impeller shaft 7 is provided the blades, so that the material is not only forced outwardly against the screen as the blades are rapidly revolved, but the slivers and other coarser particles are gradually forced from the center of the screen to opposite ends thereof. ln the described form of machine the screen is given a rotation in a direction opposite to the rotation of the impeller, but preferably at a slower rate of speed.

To deliver the stock to the interior of the screen annular feed spout means is herein provided whereby the stock is discharged through a substantially annular orifice within the impeller blades. Herein two annular feed spouts are provided, so positioned as to discharge their material outwardly against the inner edges of the rapidly rotating blades, one on each side of the spider 31. For this purpose there are provided at each end of the machine inner and outer annular spout members Sil and 35, respectively, both fixedly secured to the end castings. These extend inwardly close to the blades on the spider whereat, due to their slight separation, there is left an orifice 86 herein extending circumferentially entirely around the spout. This inwardly directed feed spout leaves an annular space within the screen at each side of the central space occupied by the spider., such annular spaces being substantially filled by the rotary blades 33. The discharge orifices 36 are so positioned that the stock discharged from the spouts within the screen is directed outwardly upon the inner edges 0f the blades and inwardly toward the center 0f the spider.

t will be observed that the described form of orifice provides for a discharge of the stock radially and symmetrically in all directions upon the rotating blades and also that this symmetrical discharge of the stock might also be secured to some substantial extent even though the circumferential orifice were interrupted at intervals by connections between the inner and outer fixed spout members 34: and 35. The described form of orifice, however, which is provided by the circumferential separation of the two fixed spout members affords an orifice of the utmost simplicity and at the same time efliciency. Herein the inner edges of the blades are provided with inwardly directed curved fingers 37 which lie within the orifice 36 and which serve both the function of keeping clear the orifice from obstructions and also partly covering the orifice to prevent too great a flow of the stock.

Suitably positioned with reference to the operative parts of the machine there may be provided any number of shower pipes, such for example, as the inwardly directed shower pipes 38 to which water under pressure is delivered through the pipes 39. The nozzles 38 are directed inwardly so as to deliver a spray of water against the blades 33 and thereby assist in clearing and freeing` the stock therefrom.

Referring to F ig. 2, the stock is delivered to the annular space, herein designated as tO, within the feed spouts through feed supply pipes ell, the latter extending rearwardly at the sides of the machine to a suitable supply tank Ll2 at the rear side ofthe machine. The stock issupplied to the tank preferably under pressure from any desired source.

As the pulp is delivered from'the feed spouts to the interior of the screen it is picked up by the blades and thrown forcibly against the screen drum. The screening operation is a continuous one and there is a continuous stream of pulp being thrown against the screening drum, the unscreened particles which lodge on the inner surface of the screen being continuously forced toward opposite ends of the screen through the annular openings in the end plates 13 and lll to the sliver outlets 4:3 and et formed in the end castings and shown at the bottom in Fig. l.

T o prevent the unscreened` particles from being forced through the joint between the rotary screen support and its fixed bearing support, the rotary screen supports 17 and 18 are provided with inner flanges or dis charge aprons 45 and 46, respectively. These extend from the annular support outwardly ever and beyond the end plates so that the coarser waste discharged from the ends of the screen pass out over the annular flanged discharge aprons 4G into the sliver outlets and are not required to come into contact with the flanged plates 15 or 16 and cannot enter the joint between the same and the rotary screen support. This prevents the unscreened particles from entering the joint and leaking down into thescreenedpulp outlet to mingle with the screened materials and from otherwise deranging the operating of the machine.

While I have herein shown and described for purposes of illustration one specific form of the invention, it is to be understood that the same is not limited to the specific details of construction herein shown or the relative arrangement or relation of parts, but that extensive deviations may be made therefrom without departing from the spirit of the invention.

Claims:

1. In a machine of the character described, the combination with a casing, a horizontally positioned screen drum located therein, a pulp outlet in communication with the interior of the casing, a sliver outlet in communication with the interior of the screen drum, a feed spout projecting into the interior of said screen and comprising inner and outer fixed annular spout members having between them a circumferential discharge orifice, and impeller means between the feed spout and the screen.

2. In 'a machine of the character described, the combination with a casing, a screen drum located therein, a pulp outlet in communication with the interior of the casing, a sliver outlet in communication with the interior of the screen drum, feed spouts projecting from opposite ends of the interior of said screen drum and comprising each fixed inner and outer annular spout members having a circumferential discharge orifice between them and impeller means between the feed spouts and the screen drum.

3.` In a machine of the character described, the combination with a casing, a horizontally positioned screen drum located therein, a pulp outlet in communication with the interior of the casing, a sliver outlet in communication with the interior of the screen drum, a feed spout comprising inner and outer annular spout members communicating' with a .feed supply and provided with means for discharging the stock radially and symmetrically into the interior of the screen, and impeller means between the feed spout and the screen comprising a plurality of impeller blades, and means for rotating the same. V

4. In a machine of the character described, the combination with a casing, a horizontally positioned screen drum located therein, a pulp outlet in communication with the interior of the casing, a sliver' outlet in communication with the interior of the screen drum, an annular feed spout extending into the interior of'said screen and provided with means for discharging material radially and symmetrically within the screen, and impeller blades between the feed spout and the screen.

5. In a machine of the character described, the combination with a casing, a screen drum located therein, a pulp outlet in communication with the interior of the casing, a sliver outlet in communication with the interior of the screen drum, annular feed spouts projecting Within the screen from opposite ends thereof, an impeller shaft passing through the feed spouts, impeller blades driven thereby and occupying the space between the feed spouts and the screen, said feed spouts having provision for discharging the stock` radially and symmetrically upon the impeller blades.

6. In a machine of the character described, the combination with a casing having a screen drum located therein, impeller blades within the screen drum, means for delivering stock to the interior of the screen drum, a sliver outlet in communication with the interior of the screen drum, a pulp outlet in communication with the interior of the casing, end plates for the casing providing a journal support for the screen drum and having openings through which the slivers are discharged, and a discharge plate carried by the screen drum and overlying the joint between the same and the end plate.

'7. In an apparatus of the class described, the combination with a screen drum, a casing within which the same is contained, end plates for opposite ends of the casing through which slivers are discharged, said end plates provided with inwardly turned flanges, screen supporting members journaled exteriorly upon said flanges, and fianged members carried b v said screen within the openings and said end plates.

8. In a machine of the character described, the combination with a casing, a rotary screen drum located therein, an opening in the end of the casing through which unscreened material is discharged, a screen supporting member journaled upon said casing, and a 'flanged plate secured to the screen and overlying the joint at the bearing between the screen supporting member and the casing.

9. In a machine of the character described, the combination with a casing, a screen drum located therein, means for feeding stock into the interior of said screen drum, impeller means therein, a support on which the screen drum is journaled provided with an opening communicating with a sliver outlet, and a discharge plate connected to the screen drum extending into the opening.

10. In a machine of the class described, the combination with a casing, a horizontally positioned screen drum located therein, a pulp outlet in communication with the interior of the casing, a sliver outlet in communication with the interior of the screen drum, a feed spout projecting into the in terior of said screen and comprising inner and outer fixed, annular spout members having between them a circumferential discharge orifice and means between the feed spout and the screen for beating the pulp against the screen and feeding the coarser particles toward the sliver outlet.

l1. In a. machine of the character de scribed, the combination With a casing, a horizontally positioned screen drum located therein, a pulp outlet in communication with the interior of the casing, a sliver outlet in communication with the interior of the screen drum, a feed spout projecting into the interior of said screen and comprising inner and outer fixed annular spout members having between them a circumferential discharge orifice and impeller blades between the feed spout and the screen inclined with relation to the length of the drum 'to cause the feeding of the coarser particles toward the sliver outlet.

12. In a machine of the class described,

the combination With a casing, a` horizontally positioned screen drum located therein,

a pulp outlet in communication with the interior of the casing, a sliver outlet in communication with the interior of the screen drum, annular feed spouts projecting Within the screen from opposite sides thereof, impeller blades occupying the space between the feed spouts and the screens, said spout having provision for discharging the stock radially and symmetrically upon the propeller blades, and said blades being inclined toward the ends from an intermediate position in a direction away from the direction of rotation, thereby to feed the unscreened particles toward the sliver outlet.

13. In machine of the class described, the combination of a casing, a horizontally positioned screen. drinn located therein, a pulp outlet in communication With the interior of the casing, a sliver outlet in communication with. the interior of the screen drum, a paddle Wheel in the screen drum for beating the pulp against the screen, and means to feed pulp stock to the interior of the drum close to the center of said paddle Wheel and near the middle plane thereofY through an annular area.

la. In a machine of tlie class described, the combination of a casing, a horizontally positioned screen drum located therein, a pulp outlet in communication with the interior of the casing, a sliver outlet in communication with the interior ofthe screen drum, a feed spout extending into the interior of the screen drinn and provided With an annular discharge orifice, agitating means in the casing and projections carried by said agitating means entering the discharge orifice.

l5. In a machine of the class described, the combination of a casing, a horizontally positioned screen drum located therein, a pulp outlet in communication with the 'interior of the casing, a sliver outlet in communication With the interior of the screen drum, a feed spout extending into the interior of the screen drum and provided with an annular. discharge orifice, impeller blades in the casing and projections carried by said impeller blades entering the discharge orilice.

1G. In a machine of the class described, the combination of a casing, a horizontally positioned screen drum located therein, a

munication with the interior of the screen H drum, a feed spout extending into the interior of tlie screen drum and provided With an annular discharge orifice, impeller blades in the casing and means carried by said impeller blades to partially obstruct said oritice.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

ANTON J. HAUG. Witnesses:

(li-nis. E. Money, RICHARD Money.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

